<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
 <title>计算结果的比较</title>  
 <script>
 var i = 5;
 var j1,j2;
  j1 = (++i)+(++i) +(++i); //j=?
   i = 5;
  j2=(i++)+(i++)+(i++); //j=?
  alert('j1 = ' + j1 +' & '+'j2 = ' + j2);
 </script>
    
</head>
<body>
</body>
</html>